Note that there are two mentions of Bill Cosby, but only one documententity.
注意，这里两次提到了Bill Cosby，但是只有一个文档实体。
2
Consider the documententity as the first item in the XML document that an XML processor encounters.
将文档实体看作是XML处理器遇到的XML文档的第一项。
3
The INSTANCES table in the EIDB records information about instances, and the DE_INST table maintains the links from each documententity to the corresponding instance.